Abstract
The purpose of the paper consists in the description of the procedure for investigations and software-hardware means for arc welding with a melting electrode in protective gas environment with the controlled transfer of electrode metal and its visualization. 
 For investigations of quick electrode metal transfer processes there was used Evercam 1000-4-C digital video-camera and RKDP-0401recorder of welding mode parameters. 
 For video-control of the process there was used a method of active illumination with the further image filtration. It is determined that the visualization of a welding drop transfer dynamics during arc welding with melting electrode in protective gases should be carried out in the infrared range on one side limited with the curve of a spectral transmission of light filters – 950 nm, and on the other side of a matrix sensitivity spectral curve of a rapid camera -1050 nm. 
 There is developed software in the environment of the LabVIEW graphical programming allowing the fulfillment of adjustment and programming welding mode parameters and high-speed shooting, device synchronization, superposition on oscillograms of electric parameters of the electrode metal image transfer, definition of power characteristics at different interval of drop transfer. 
 The CMT (Cold Metal Transfer) process with the aid of the equipment of Fronius TransPuls Synergic 3200 is investigated. It is defined that for arc welding in protective gases an optimum frequency of video-shooting is 1500-2000 shots per second at resolution from 640x608 pixels to 320x400 pixels that allows analyzing efficiently rapid processes of drop transfer.
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